Whilst I didn't try Perceptol at either dilution, I have to thank Edge of Darkness and subsequently Barry himself for giving me the confidence to try 'sophisticated' two bath developers. These were something I long regarded as being a significant distance beyond which I could reasonably use. These fears were broken down by him doing the hard work and publishing these findings so that I could reap the rewards and move my film processing to a new level. That he made a modest amount from me as recompense for his effort troubles me not one iota and am glad that I contributed in a small way to his livelihood. When querying the thin nature of my films in Exactol Lux, he sent me one of his negatives so I could compare first hand.
When Barry died, I was forced to seek an alternative and so Gordon Hutchings subsequently earned money from me with his book and PMK solutions.
Things have now moved on with the internet and I commend people such as Sandy for their willingness to share the results of their toils free. It pains me when people then criticise such well meaning development specialists. I'd rather utilise their expertise and information and spend longer trying to improve the standard of my photographs, yet have a beneficial but small part of their efforts present in every one of my images.